Astria Coaxial Acoustic Design: The probably most modern audio design on the market. A small, feather-light earbud combines a balanced Knowles audio driver with a sturdy housing and a powerful 11 mm dynamic driver. Thanks to the direct alignment to the ear, Astria minimizes disruptive overlaps in sound, providing you with an absolutely natural and authentic sound profile for a musical experience with an extra dose of clarity and bass - just like in a concert hall. Your in-ear sound studio: The audio quality of a recording studio - all in a small earbud? No problem. Thanks to the inner ACAA design (Astria Coaxial Acoustic Architecture), this is now possible. Every note, every word, and every emotion counts and is reproduced with original authenticity. All nuances and subtleties are taken into account, just as the artist intended for your music. Individuality with HearID: Your hearing is unique. Therefore, your music should be too. Headphones that sound amazing to you may be insignificant to someone else. Enormous endurance: Enjoy up to 8 hours of wireless playback time after just one charge, plus an additional 4 full charges with the compact charging case. And if you're in a hurry, just 10 minutes of charging provides a full 2 hours of playback. Four microphones with state-of-the-art ambient noise cancellation offer a top-notch music experience as well as precise phone calls. Rely on 95% more voice isolation and 60% less background noise.